 The M880/M890 had a conventional 12-volt electrical system; a separate 24-volt system was added to certain variants of the trucks to power communications units, but this precluded power steering on those units—the pump location being taken up by the 24-volt generator.The gasoline engine was out of step with the military's move toward diesel engines during this time period.The lack of power steering was a hindrance in off-road, close quarters, and snow-plowing duties (although most civilian and Air Force models had power steering).